Vermont Casting DVRT36, DVRT43, DVRT39 manual Vertical Sidewall Application, 10002428

Vermont Castings, Majestic Products DVRT36/39/43

Finished

Wall

These ends screwed

to appliance.These ends should be even.

Vent Termination

3 x 90° Elbows

3 x 90°

Elbows

FP1176

FP1005

Fig. 22 Flat to the wall installation.

Vertical Sidewall Application

It is very important the venting system maintain its balance between the combustion air intake and the flue gas exhaust, therefore, certain limitations as to vent configurations apply and must be strictly adhered to.

The Vent Graph (Page 14), showing the relationship between vertical and horizontal side wall venting, will help to determine the various dimensions allowable.

Minimum clearance between vent pipes and com- bustible materials is 1” (25mm) on top, bottom and sides unless otherwise noted.

When vent termination exits through foundations less than 20” (508mm) below siding outcrop, the vent pipe must flush up with the siding.

It is best to position the fireplace so the number of offsets and horizontal vent length are minimized.

The horizontal vent run refers to the total length of vent pipe from the flue collar of the fireplace (or the top of the Transition Elbow) to the face of the outer wall.

Horizontal plane means no vertical rise exists on this portion of the vent assembly.

When installing the appliance as a rear vent unit, the 90° or 45° transition elbow attached directly to the rear of the unit is NOT INCLUDED in the following criteria and calculations, and unless specifically mentioned, are to be ignored when calculating venting layouts.

Fig. 23 Maximum three (3) 90° elbows per installation.

•The maximum number of 90˚ elbows per side wall installation is three (3). (Fig. 23)

•If a 90˚ elbow is fitted directly on top of the fireplace flange, the maximum horizontal vent run before the termination or a vertical rise is 36 in. (914mm). (Fig. 24)

		36"
	36"	(914mm)
		Max.
	(914mm)
	Max.
		FP1177
Fig. 24	Maximum horizontal run with no rise.

•If a 90° elbow is used in the horizontal vent run (level height maintained), the horizontal vent length is reduced by 36” (914 mm). (Fig. 25a and

Fig. 25b) This does not apply if the 90° elbow is used to increase or redirect a vertical rise. (Fig. 25b)

Example: According to the Vent Graph (Page 14), the maximum horizontal vent length in a system with a 7.5’ (2.3m) vertical rise is 20’ (6m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17’ (5.2m).

90o

A B

A + B = 17’ (Max.)

7’6"

FP1178

Fig. 25a Horizontal run reduction.

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